﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234237

namespace Windows8AppsExample
{
    /// <summary>
    /// A basic page that provides characteristics common to most applications.
    /// </summary>
    public sealed partial class EventHandling : Windows8AppsExample.Common.LayoutAwarePage
    {
        private Random rand = new Random();
        private byte[] rgb = new byte[3];

        public EventHandling()
        {
            this.InitializeComponent();
            //DispatcherTimer timer = new DispatcherTimer();
            //timer.Interval = TimeSpan.FromSeconds(1);
            //timer.Tick += OnTimerTick;
            //timer.Start();

            CompositionTarget.Rendering += CompositionTarget_Rendering;
        }

        private void CompositionTarget_Rendering(object sender, object e)
        {
            contentGrid.Background = GetRandomBrush();
        }

        private void OnTimerTick(object sender, object e)
        {
            contentGrid.Background = GetRandomBrush();
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            txtBottomCenter.Foreground = GetRandomBrush();
            txtBottomLeft.Foreground = GetRandomBrush();
            txtBottomRight.Foreground = GetRandomBrush();
            txtCenterCenter.Foreground = GetRandomBrush();
            txtCenterLeft.Foreground = GetRandomBrush();
            txtCenterRight.Foreground = GetRandomBrush();
            txtCenterRight.Foreground = GetRandomBrush();
            txtTopCenter.Foreground = GetRandomBrush();
            txtTopLeft.Foreground = GetRandomBrush();
            txtTopRight.Foreground = GetRandomBrush();
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="e"></param>
        protected override void OnTapped(TappedRoutedEventArgs e)
        {
            if (e.OriginalSource is TextBlock)
            {
                (e.OriginalSource as TextBlock).Foreground = GetRandomBrush();
            }
            else if (e.OriginalSource is Grid)
            {
                (e.OriginalSource as Grid).Background = GetRandomBrush();
            }
            base.OnTapped(e);
        }

        /// <summary>
        /// Get random brush
        /// </summary>
        /// <returns></returns>
        Brush GetRandomBrush()
        {
            rand.NextBytes(rgb);
            Color clr = Color.FromArgb(255, rgb[0], rgb[1], rgb[2]);
            return new SolidColorBrush(clr);
        }
    }
}
